Car-brake.



PATENTBD AUG. 2s, 1904. A. PPQSER & A. NBHREN.

' GAR BRAKE.

APPLICATION FILED JAN.5, 1904.

No. 768,399. y l

N0 MODEL.

- Wihnesses 'l UNITED STATEs Patented August 23, 1904.

PATENT QFFICE.

CAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 768,399, dated August 23, 1904.

Application ileddanuary 1904.

To all whom, it may concern:

Be it known that we, ADoLF Pnosnn and AMBRos NEHREN, subjects of the Emperor of Germany, and residents of Achern, Badenia,v German Empire, have invented certain new and useful Improvements in Car-Brakes; and we do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The purpose of our new brake is to quickly stop the rolling-stock to which it is applied. Its maximum effect is reached when after the brake has been applied the car rises automatically and presses with itsy own weight upon the brake.

rIhe new brake differs from prior construcdrawings, in which- Figure l is a vertical section taken on the line A B of Fig. 2 and showing the brake in position of rest. Fig. 2 is a vertical section on the line C D of Fig. l seen from the left hand. Fig. 3 is a side elevation showing a brake tted with a forked shoein operation. Fig'. 4 is an end elevationof Fig. 3.

In Figs. 3 and 4 it willbe observed that the brake is applied by means of a crank-shaft, whereas in Figs. 1 and 2 it is applied by the ordinary air or vacuum brake, in which case the instantaneous brake is provided with a special air-pipe running adjacent to or in the ordinary air-pipe on the cars.

A railway-car is usually fitted with four and a street-car with two such brakes either with wedge or fork shoes, and each brake is guided on a cheek riveted to the frame w between strong pins p. The brake-shoe r is not rigidly mounted, but turns on a bolt 1/ in a. slide d and is connected by the latter with the piston-rod b, Fig. l, projecting from the aircylinder a, or with the crank-shaft 7i; by means of a crank-rod W, Fig. 3.

In order to be able to apply the brake for both directions of travel of the car, the shoe r is symmetrically shaped on either side of the center line passing through the bolt y, and

serial No. 137,854. (No man.)

, the sides of the slide d are chamfered below If -the ordinary brake is found to be insufficient or if there is danger through delay in braking, the airpipe of the instantaneous brake is broughtinto use, Fig. 1, or the crankshaft 7c isrturned, Fig.' 3, whereby each slide CZ, with the brake-shoe r, will descend, and

the wedge end of the shoe 1" comes between the rails, Fig. 2, or the fork-shaped end r grips over the head, of the rail, Fig. 4, and slides thereon. tween the two surfaces becomes more intimate (that is, supposing the braking action is to'be increased) the .shoe r, acting as wedge,

owing to the rigid frictional resistance acting oppositely to the direction of travel will force itself belowthe adjacent surface f, Fig. 3. Since this surface slides along the inclined face of the wedge owing to the m's mba, the entire car will in the next moment rise on the two (or four) brake-shoes and will slide with them for a short distance only, as these shoes support the car freely, s'o that the car forces Athe sliding member between (or on) the head of the rail with maximum pressure. This lift of the car is indicated in Fig. 3 by the broken line representingthe contour of aportion of the wheel.

In order to prevent the shoe r from rising after the brake has been applied, the pistonrod I), which is connected to the slide at e, is

provided with ratchet-teethin which a dog s As the frictional contact bel is turned in the dir'ection of the arrow, Fig.

3, from the vertical position into the position of braking'. In order to be able to return the brake-shoe tothe position of rest afterl the car has been stopped, the dog s must be released.

This brake is naturally only applied, for instance, when in theease of street-cars life is in danger or in the case of railway trafgc a collision is imminent. It will bev'observed that the wear of the tire has no in'uence `upon the .action of the brake, as the surfaces of support f sink with the slice, such as is the case with no other brake.

Having thus described Jour invention, we clairn as new- A car-brake comprising a slide having lowei` inclined surfaces of support, slide-guides secured to the car-frame, a rod connected to the slide and supporting the saine, zi brake/shoe pivoted to the slide and on application of the brake frictionally engaging the Tail, and wedging itself between the saine und one of the said inclined surfaces, in combination with ineens for causing descent of tlie rod connected to the slide und ineens for plcventing rcn lense of the bl'zile after application, SnbStnntially as described.

In testimony tlmt we elnini the foiegoilm` :is our invention we lia-ve sig-ned oni' nannes in presence of two Subscribing witnesses.

.ADOLF PFOSIGH. AM BROS N El l li ICN. fitnessesz JOSEPH Roimnn, GUSTAV Scnwmiss. 

